Mixing crops and livestock allows farmers to
A) distribute the workload of the crops and livestock so that farmers hardly need to work during the summer season.
B) generate 90 percent of their income from the sale of livestock.
C) doublecrop.
D) create a system where crops provide food for livestock and the livestock provide manure for crop fertilization.
E) circumvent market forces that determine the prices of livestock and crops.
Answer: D
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